A sensitivity analysis of crash modification factors of access management techniques in highway safety manual

Michael Williamson, Mohammad Jalayer, Huaguo Zhou, Mahdi Pour Rouholamin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

Access management involves control, planning, and coordination of access along roadways to provide safe and efficient operation of transportation networks. According to existing literature, reducing conflict points and improving traffic safety are the main goals of access management techniques. Increase in traffic volumes and rapid growth of roadway networks have made these efficient techniques as a crucial part of roadway planning and design process. Some of the access management techniques employed in the recently published Highway Safety Manual (HSM) include: median treatments, traffic signal spacing, auxiliary lanes, corner clearances, driveways, U-turns as alternatives to direct left-turns, and frontage roads. Moreover, the Crash Modification Factors (CMFs) of these techniques, as estimators of the actual safety effect of countermeasures, are utilized in the HSM predictive methods to approximate the potential changes in crash frequency and severity after treatment implementation. The results of this study provide transportation agencies, practitioners, and decision-makers with a better understanding of how the HSM methods quantify the safety effects of access management techniques on different roadways. This is accomplished by providing output in the form of tabulated ranking of the impact of access management parameters for three roadway facilities defined in the HSM using the graphical method of sensitivity analysis.

Original languageEnglish (US)
Title of host publicationAccess Management Theories and Practices - Proceedings of the 2nd International Conference on Access Management, AM 2014
EditorsZhongyin Guo, Baoshan Huang, Zhongren Wang
PublisherAmerican Society of Civil Engineers (ASCE)
Pages76-88
Number of pages13
ISBN (Electronic)9780784413869
DOIs
StatePublished - 2014
Externally publishedYes
Event2nd International Conference on Access Management: Access Management Theories and Practices, AM 2014 - Shanghai, China
Duration: Sep 25 2014Sep 27 2014

Publication series

NameAccess Management Theories and Practices - Proceedings of the 2nd International Conference on Access Management, AM 2014

Conference

Conference2nd International Conference on Access Management: Access Management Theories and Practices, AM 2014
Country/TerritoryChina
CityShanghai
Period9/25/149/27/14

All Science Journal Classification (ASJC) codes

  • Transportation
  • Civil and Structural Engineering
  • Safety, Risk, Reliability and Quality

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